diff --git a/Sources/Kapture/CaptureController.swift b/Sources/Kapture/CaptureController.swift
index 910aa0c..a584dec 100644
--- a/Sources/Kapture/CaptureController.swift
+++ b/Sources/Kapture/CaptureController.swift
@@ -10,10 +10,21 @@ final class CaptureController: NSObject {
     private var previousApp: NSRunningApplication?
     private var overlayIDs: [Int] = []
 
+    /// Session event log for debugging (dumped via Copy Diagnostics).
+    static var sessionLog: [String] = []
+    static func log(_ line: String) {
+        sessionLog.append(line)
+        if sessionLog.count > 100 { sessionLog.removeFirst() }
+        NSLog("[Kapture] \(line)")
+    }
+
     /// Diagnostic snapshot for "Copy Diagnostics" menu item.
     func diagnostics() -> String {
         var lines: [String] = []
-        lines.append("Kapture diagnostics")
+        lines.append("Kapture diagnostics — version \(Bundle.main.infoDictionary?["CFBundleShortVersionString"] ?? "?")")
+        lines.append("--- session log (newest last) ---")
+        lines.append(contentsOf: Self.sessionLog)
+        lines.append("--- screens ---")
         for (i, s) in NSScreen.screens.enumerated() {
             let scale = s.backingScaleFactor
             let cgID = (s.deviceDescription[NSDeviceDescriptionKey("NSScreenNumber")] as? NSNumber)?.uint32Value ?? 0
diff --git a/build-app.sh b/build-app.sh
index e76d97d..3efc363 100755
--- a/build-app.sh
+++ b/build-app.sh
@@ -108,9 +108,9 @@ cat > "$APP/Contents/Info.plist" <<'PLIST'
     <key>CFBundleIconFile</key>
     <string>Icon</string>
     <key>CFBundleShortVersionString</key>
-    <string>1.6.0</string>
+    <string>1.6.1</string>
     <key>CFBundleVersion</key>
-    <string>60</string>
+    <string>61</string>
     <key>LSUIElement</key>
     <true/>
     <key>NSHighResolutionCapable</key>